I understand what you're saying but car that I have on e-bay at the mo has only done 3900 miles since April 2005... I did have a company car and still have my motorbike so hardly got used
Current DoT stats show 1 in 4 cars have inaccurate mileage.
One of Omega's strengths is the way it easily eats up miles, and rarely shows the wear that those miles normally would.
Add in how easy it is to remove dash (5 mins, and all screws hidden), it makes them a prime candidate for clocking.
My personal view is Police sold car at 66k, I wonder how many owners since then? Also, Omegas tend not to be the sort of cars that sit on driveway unused, or just used to potter around town.
I suspect the previos MOTs (which may give clues to mileage) may be missing....
By all means check it out, but ring previous owner and ask about mileage before buying.
HTH